Dyeing or coloring of products made with cellulose acetate



Patented Aug. '11, 1931 PATENT OFFICE GEORGE HOLLAND ELLIS, OF SPONDON,

NEAR DERBY, ENGLAND, ASSIGNOB 'ro CELANESE CORPORATION OF AMERIGA, A CORPORATION 01 DELAWARE DYEING OB COLORING OF- PRODUCTS MADE WITH CELLULOSE ACETATE Io Drawing, Original application fled September 25, 1923, Serial Kc. 864,781 and in Great Britain January 27, 1923. Divided and thisapplication filed December 27, 1926. Serial No, 157,412.

In my U. S. Patent No. 1,618,413 granted Feb. 22, 1927 there is described a process for dyeing, coloring, printing or stencllling yarns, threads, filaments, fabrics, films r 6 other materials consisting of cellulose acetate alone or associated with other fibres or materials.

The said U. S. Patent 1,618,413 described the dyeing, printing or stencilling of such 10 goods or materials with any organic comounds or coloring matters which are avourably constituted or have an afiinity for cellulose acetate or are capable of dyeing or coloring the same, but which are insoluble, practically insoluble or of relatively low solubility in water, all of which are hereinafter included in the expression relatively water-insoluble by employing them in the form of dispersed, i. e. soluble or more soluble modifications obtained by pretreating them with one or more bodies havin oily or fatty characteristics containing sift-forming groups capable of forming soluble salts with alkalies or ammonia, for

examplethe sulpho group or the carboxyl group or both sulpho and carboxyl groups, or salts of such bodiessuch for instance as their sodium or other alkali salts or ammonium salts. Such bodies and their salts are hereinafter, as in the said patent ineluded in the term bod of'oily or fatty characteristics. In particular according to my said U. S. patent one can employ dispersed modifications obtained by treating the said organic compounds or coloring mat ters with sulphoricinoleic or other sulphonated fatty acids or salts thereof such as the alkali or ammonium salts. Other bodies of oily or fatty characteristics instanced in my 40 said U. S. patent are for example oleic,

stearic or palmitic acid and salts thereof such as the alkali and ammonium salts.

The specification of my said U. S. Patent 1,618,414 gives many examples of classes of organic compounds or coloring matters insoluble or of relatively low solubility in water which may be applied in dispersed modifications as referred to. Amongst these are indicated unsul honated or other insoluble or relatively insoluble compounds or coloring matters of the azo class; unreduced coloring matters of the substituted quinone-monoimide series, generally comprised within the term indophenols; colormg matters or compounds of the following classes, usually containing no sulpho groups :diphenylmethane, triphenylmethane, triarylmethane, oxazine, azine, diaorganic compounds or coloring matters or of the simple amino bases may be employed for the dyeing of mixed materials containing cellulose acetate associated with cotton, silk, wool or other threads or fibres. Especially it is stated that the dispersed modifications of favourably constituted organic compounds or coloring matters may be applied to the dyeing of goods consisting of cellulose acetate and one or more of the fi-,

vbros; cotton, wool, silk, artificial lks of the cellulose type, having 110 aflinity or less ailinity than the cellulose acetate for said dispersed compounds or coloring matters, so

that the cellulose acetate is selectively or preferentially colored thereby, the other fibre, or one or more of the other fibres, being dyed or colored to similar or difierential shades relatively to the cellulose acetate by other coloring matters 'or-compounds or the employment of such other coloring matters or compounds being omitted.

It is further stated in my said U. S. patent that in dyeing materials consisting of or containing cellulose acetate with the dispersed modifications of any of the insoluble or relatively low soluble organic compounds or coloring matters having an aifinity for cellulose acetate, other dyes may or may not be employed in combination or association with them in the same operation, or in separate operations, forthe production of compound shades on the cellulose acetate.

For further particulars and examples of organic compounds or coloring matters insoluble or of relatively low solubility in water, which may be applied in dispersed modifications as aforesaid for d eing goods consisting of or containing cellul ose acetate, and asto the manner in which they may be applied, I refer to my said Patent 1,618,413.

Now U: S. Patent 1,618,414, of which the present is a divisional application, likewise concerns the dyeing of goods such as referred to consisting of or containing cellulose acetate with the aid of dispersed i. e. soluble or more soluble, modifications of organic compounds or coloring matters having an aflinity for or capable of coloring cellulose acetate but insoluble, ractically insoluble or of relatively low so ubility in water, all of which are herein included in the expression relatively water-insoluble. The said U. S. Patent 1,618,414 states that in any of the cases referred to in the speci-.'

fication of said Patent 1,618,413 one may employ wholly or partly instead. of the dis-- persing agents therein referred to, other organic bodies as dispersing agents for the organic compounds or coloring matters or simple amino bases to be applied to the materials consisting of or containing cellulose acetate.

Such other organic dispersing agents comprise a wide range of non-oleaginous compounds, being organic derivatives containing in their structure one or more salt forming groups such as the sulphonic, carboxyl, or hydroxyl groups, (whether the compound contains only one kind of these groups or different kinds of these groups at the same time) and salts of such bodies; for-example one may employ phenols, sulphonic acids, carboxylic acids, phenol-sulphonic acids or pther derivatives of the benzene, naphthalene or anthracene series, containing one or more of any of these groups, or derlvatives of other cyclic hydrocarbons, saturated or nonsaturated, containing one or more of the.

above mentioned groups, such for example as the naphthenic acids, naphthene sulphonic acids or other carboxylic or sulphonic acids of the cycle paraflins or one may employ the sodium or other salts of one or more of any of the above mentioned derivatives.

All such organic salt forming derivatives as aforesaid and their salts are hereinafter referred to as carbocyclic dispersing agents. Now the present divisional application has for object to claim specifically the employment in any of the processes of Patent 1,618,414 of the unreduced coloring matters of the substituted quinone mono-imide series, generally comprised within the term indophenols. The dispersed modifications thereof may be made by merely grinding or mixing the dispersing agent or mixtures of dispersing agent, with the suitable coloring matter, organic compound or simple amino base, etc., or by heating under ordinary atmospheric pressure or under increased or reduced pressure in the resence or absence of water. The dispersed modifications of the coloring matter or compound or mixtures of same ,may then be utilized for any of the purposes described in the specification of my said Patent 1,618,413 for example:

For the dyeing of acetyl cellulose, by simply dissolving the dispersed modification in hot or cold water, filtering into the dyebath (which may be acid, neutralonalkaline) and conducting the dyeing as usual 3 For rinting or stencilling acet l cellulose, by thic ening, as may be require a solution of the dispersed modification, or mixture of such, by the use of substances such as starches, gums, flour and the like, and applying in the usual manner, followed by such after-treatment as may be requisite;-

For the dyeing or printing of mixed goods containing acetyl cel ulose, either in uniform shades or in contrasting colors or leaving the material other than the acetyl cellulose uncolored.

It is further understood that mixtures containing different carbocyclic dispersing agents of the said Patent 1,618,414 may be employed, or mixtures of-one or more of them with one or more of the dispersing agents of my said Patent 1,618,413, and that the expression a medium com rising a carbocyclic dispersin agent in t e claims is to be read as inclu 'ng any such mixtures as well as the individual carbocyclic dis-' persing agents themselves.

The term dyeing in the claims includes dyeing, printing and stencilling.

The term com ound of the na hthenic acid class in the c aims comprises the naphthenic acids and naphthene sulphonic acids medium comprising a carbocyclic dispersing I agent which is a com ound of the class consisting of naphthemc acids and naphthene sulphonic acids and their salts.

3. In and for the dyeing of yarns, fabrics and other. products comprising cellulose acetate, the employment of relatively waterinsoluble unreduced indophenol coloring matters, said coloring matte'rs being employed in the form of dispersed modifications obtained by pretreating them with a medium comprising a carbocyclic dispersing agent which is a na hthenic acid salt.

4. In and'for the yeing of yarns, fabrics and other products comprising cellulose acetate, the employment of relatively waterinsoluble unreduced indophenol coloring matters, said coloring matters being employed in the form of dispersed modifications obtained by pretreating them with a medium comprising. a naphthenic acid sodium salt.

5. In and for the dyeing of yarns, fabrics and other products comprising cellulose acetate, the employment of relatively waterinsoluble unreduced indophenol coloring matters, said coloring matters being employed in the form of dispersed modifications obtained by pretreating them with a' clic dispersing mixture comprising a carboc ody of oily or atty characteragent and a istics.

6. In and for the dyeing of yarns, fabrics and other products comprising cellulose acetate, the employment of relatively waterinsoluble unreduced indophenol coloring matters, said coloring matters being employed in the form of dispersed modifications obtained by pretreating them with a mixture comprising a carbocyclic dispersing agent which is a compound of the class consisting of naphthenic acids and naphthene sulphonic acids and their salts and a higher fatty acid compound.

7. In and for the dyeing of yarns, fabrics and other products comprising cellulose acetate, the employment of relatively waterinsoluble unreduced indophenal coloring matters, said coloring matters being employed in the form of dispersed modifications obtained by pretreating them with a mixture comprising a carbocyclic dispersing agent which is a compound of the claw consisting of naphthenic acids and naphthene sulphonic acids and their salts and a sulphonated ricinoleic acid compound.

8. In and for the dyeing of yarns, fabrics and other products comprislng cellulose acetate, the employment of relatively waterinsoluble .unreduced indophenol coloring matters, said coloring matters being employed in the form .of dispersed modifications obtained by pretreating them with a mixture comprising a carbocyclic dispersin agent which is a naphthenic acid salt an sodium salt of sulphoricinoleic acid.

In testimony whereof I have hereunto subscribed m name.

GE RGE HOLLAND ELLIS. 

